Surface‐modified Ag@Ru‐P25 for photocatalytic CO2 conversion with high selectivity over CH4 formation at the solid–gas interface

Hiragond, Chaitanya B.; Biswas, Sohag; Powar, Niket S.; Lee, Junho; Gong, Eunhee; Kim, Hwapyong; Kim, Hong Soo; Jung, Jin‐Woo; Cho, Chang‐Hee; Wong, Bryan M.; In, Su‐Il

doi:10.1002/cey2.386

Title: Surface‐modified Ag@Ru‐P25 for photocatalytic CO₂ conversion with high selectivity over CH₄ formation at the solid–gas interface (in EN)

Journal Article · 11 July 2023 · Carbon Energy

DOI: https://doi.org/10.1002/cey2.386 · OSTI ID:1989258

^[1]; Biswas, Sohag ^[2];

^[1]; Lee, Junho ^[1]; Gong, Eunhee ^[1];

^[1]; Kim, Hong Soo ^[1]; Jung, Jin‐Woo ^[1]; Cho, Chang‐Hee ^[1];

^[2];

^[3]

Daegu Gyeongbuk Institute of Science and Technology (DGIST) (Korea, Republic of)
Univ. of California, Riverside, CA (United States)
Daegu Gyeongbuk Institute of Science and Technology (DGIST) (Korea, Republic of); NiceScience Corporation, Daegu (Korea, Republic of)

Systematic optimization of the photocatalyst and investigation of the role of each component is important to maximizing catalytic activity and comprehending the photocatalytic conversion of CO₂ reduction to solar fuels. A surface-modified Ag@Ru-P25 photocatalyst with H₂O₂ treatment was designed in this study to convert CO₂ and H₂O vapor into highly selective CH₄. Ru doping followed by Ag nanoparticles (NPs) cocatalyst deposition on P25 (TiO₂) enhances visible light absorption and charge separation, whereas H₂O₂ treatment modifies the surface of the photocatalyst with hydroxyl (–OH) groups and promotes CO₂ adsorption. High-resonance transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray absorption near-edge structure, and extended X-ray absorption fine structure techniques were used to analyze the surface and chemical composition of the photocatalyst, while thermogravimetric analysis, CO₂ adsorption isotherm, and temperature programmed desorption study were performed to examine the significance of H₂O₂ treatment in increasing CO₂ reduction activity. The optimized Ag_1.0@Ru_1.0-P25 photocatalyst performed excellent CO₂ reduction activity into CO, CH₄, and C₂H₆ with a ~95% selectivity of CH₄, where the activity was ~135 times higher than that of pristine TiO₂ (P25). For the first time, this work explored the effect of H₂O₂ treatment on the photocatalyst that dramatically increases CO₂ reduction activity.

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Research Organization:: Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC)

Grant/Contract Number:: SC0022209

OSTI ID:: 1989258

Journal Information:: Carbon Energy, Journal Name: Carbon Energy Journal Issue: 1 Vol. 6; ISSN 2637-9368

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: EN

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Title: Surface‐modified Ag@Ru‐P25 for photocatalytic CO2 conversion with high selectivity over CH4 formation at the solid–gas interface (in EN)

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Title: Surface‐modified Ag@Ru‐P25 for photocatalytic CO₂ conversion with high selectivity over CH₄ formation at the solid–gas interface (in EN)